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标题: [求助]模考数学第一题就不会了!! [打印本页]

作者: Gavin_win    时间: 2006-11-7 00:11
标题: [求助]模考数学第一题就不会了!!

Amy’s grade was the 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 were higher than Amy’s, and the rest were lower. If no other grade was the same as Amy’s grade, then Amy’s grade was what percentile of the grades of the two classes combined?

A .72th   B. 80th  C. 81st   D. 85th   E. 92th

 

答案:D

今天模考第一道题就是这个,耗了5分钟,也没有想法。结果导致后面的题目狂简单,47分收场。
            
这道题现在也没弄明白,请各位指教!!谢谢


作者: unclekin    时间: 2006-11-7 00:27
以下是引用Gavin_win在2006-11-7 0:11:00的发言:

Amy’s grade was the 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 were higher than Amy’s, and the rest were lower. If no other grade was the same as Amy’s grade, then Amy’s grade was what percentile of the grades of the two classes combined?

A .72th   B. 80th  C. 81st   D. 85th   E. 92th

 

 

答案:D

今天模考第一道题就是这个,耗了5分钟,也没有想法。结果导致后面的题目狂简单,47分收场。
   
这道题现在也没弄明白,请各位指教!!谢谢

Amy在A班的80个人里面排名是90%,即有8人比她高分

当两班合并的时候 有8+19=27人比她高分 1-27/(80+100)=85%


作者: xiangqinzh    时间: 2006-11-7 00:30
不要太在意摸考,我今天摸考,,第一题就是BF的CR,前十题2篇阅读,把我做傻了,就一道SC(我做对了),害的前面狂错,但好象实际考试的都不是这样,变态的ETS
[此贴子已经被作者于2006-11-7 0:43:17编辑过]

作者: unclekin    时间: 2006-11-7 00:40
以下是引用xiangqinzh在2006-11-7 0:30:00的发言:
不要太在意摸考,我今天摸考,,第一题就是划线的CR,前十题2篇阅读,把我做傻了,就一道SC,我做对了,但好象实际考试的都不是这样,变态的ETS
划线CR是BF的意思么?不要再骂ets啦现在gmat已经与他无关啦
作者: xiangqinzh    时间: 2006-11-7 00:46
以下是引用xiangqinzh在2006-11-7 0:30:00的发言:
不要太在意摸考,我今天摸考,,第一题就是划线的CR,前十题2篇阅读,把我做傻了,就一道SC,我做对了,但好象实际考试的都不是这样,变态的ETS

划线CR是BF的意思么?不要再骂ets啦现在gmat已经与他无关啦

 

 

是的,那个叫什么pearson的也不是好东西,害的我们真苦  


作者: unclekin    时间: 2006-11-7 00:51
以下是引用xiangqinzh在2006-11-7 0:46:00的发言:

是的,那个叫什么pearson的也不是好东西,害的我们真苦  

一起痛快地鄙视他吧

  --考前6天的我与你共勉


作者: Gavin_win    时间: 2006-11-7 02:31

 多谢楼上两位指点。

本人对GMAT也怀有复杂的情绪。

不过,既然自己选择了这条路,就得义无反顾地走下去!

与大家共勉,祝各位凯旋!!


作者: carolinezl    时间: 2006-11-7 10:03

我感觉是这样子做,

[90%*80+(1-19%)*100]/(80+100)=85%






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